Enter number of pixels. This is the number of pixels across the resulting image and not the cell size:

Bedrock geology
Superficial deposits

Bedrock geology

Superficial geology

Borehole results

Earthquake results

Geology of Britain viewer

The Geology of Britain viewer combines a number of key British Geological Survey data
products in a single viewer. To facilitate this, the viewer can operate in one of four modes:

Surface Geology

3D Models

Borehole Scans

Earthquake Timeline

To switch modes, use the 'Surface Geology', '3D Models', 'Borehole Scans' and 'Earthquake Timeline' buttons
located under the banner.

&nbsp&nbspSurface Geology mode

In this mode, the viewer displays either bedrock geology, superficial deposits or a combined map
showing both bedrock geology and the overlying superficial deposits (the default). More geological
layers (artificial ground, faults, mass movements) are available through a
WMS service.

Click on the map to bring up an information window giving details of the geology
at that location. If you are viewing the combined geology map, clicking on either 'Bedrock geology'
or 'Superficial deposits' in the title bar of this information window allows you
to toggle between the two results. Click on the 'Further details' link to open the
BGS Lexicon of Named Rock Units.

Click on the geology key button to view a key of the currently visible geology.
Click on the rock name to open the BGS Lexicon of Named Rock Units.

At the full extent, 1:625 000 scale geology is displayed. Zoom in to switch to 1:
50 000 scale geology. The scale of the currently displayed geology is shown. Zooming
in too far will cause the geology to switch off entirely. These scale levels are
required to view boreholes in the borehole scans mode.

5% of 1:50 000 scale data is unavailable for England, Scotland and Wales.
Only 1:625 000 scale data is available for Northern Ireland.

&nbsp&nbsp3D Models mode

Select the 3D models mode to drill virtual boreholes or draw virtual cross-sections
and sections through a geological model in selected areas of the UK; reflecting
a range of geological settings. This tool offers a glimpse into how geological models
will be increasingly made accessible via web browsers without the need for additional
software to be installed by the user.

To interrogate a model, first choose a model of interest from the drop down list. The map
will then zoom to that model.

To place a borehole: Click on the 'Drill Borehole' button and then click inside
the model's grid at your area of interest.

To draw a cross-section: Click on the 'Draw Cross-section' button and then click
inside the model's grid at your start position. Continue single-clicking to create
a line-of-section. Double click to finish.

To create a horizontal section: Click on the 'Horizontal Section' button and then
click anywhere inside the model. A popup appears with input fields for depth and
number of pixels. It is possible to enter depth relative to sea level (this can be a positive
value for depth above, a negative value for depth below or 0 ) or depth below ground level
(positive value only). Enter the number of pixels (nRows X nCols) you want in the resulting
image. The value of 75 is set as a default, but this can be changed. The higher the resolution,
the longer it takes to query the model and generate the image. Click on Generate Section
button to generate the virual cross section.

This virtual borehole and section viewer is based on a prediction of the geological
sequence that would be encountered in a vertical borehole or section drilled at
this location and should not be used as a replacement for site investigation. The
total depth of the borehole or section and the level to which the succession is
subdivided is based on 3D geological modelling and may not represent the complete
vertical borehole or section. Lithological information is generalised for each geological
unit, and local conditions may vary. For comprehensive information of the Geology
at this point or line, please use the BGS GeoReport service.

&nbsp&nbspBorehole Scans mode

In this mode, boreholes are displayed on the map once you have zoomed in sufficiently. Boreholes are
coloured according to their depth as indicated in the key.
Click on a borehole of interest to view some basic information about that borehole and
to access a link to view a scan of the borehole record.

Where boreholes are coloured black, we are unable to provide a direct link to the associated
scanned borehole record. We may still be able to provide you with a borehole record via our
GeoRecords Plus+ service. Please note, releasing confidential data can take significant time
as the process involves third parties and may not always be successful. BGS will endeavour
to facilitate the release of borehole records wherever possible.

Select the Earthquake Timeline mode to view UK earthquakes over time. On selecting this mode,
a time slider will appear at the bottom of the map.

Drag the minimum and maximum date tabs to view only earthquakes between (and including) these two
dates. Use the Play, Pause, Next and Previous buttons to navigate along the time slider.

Left-click on an earthquake to return more details of that earthquake.

General Help: Navigation

Move around the map by the arrow buttons on the top left of the map or left-clicking
and dragging the mouse in the direction you wish to travel. To zoom in or out of
the map, use the plus and minus buttons on the top left of the map. Alternatively,
you can use the mouse wheel to zoom in and out of the map. Holding the Shift key
and dragging a rectangle allows you to zoom in to that extent.

Zoom to a Location

To zoom to a known location (e.g. a postcode or town), click on the 'Go to Location'
button.

Change the Basemap

To choose between a selection of basemaps (including OpenStreetMap and the 1815
William Smith geology map) click on the 'Switch Basemap' button.

Geology Transparency

To change the transparency of the geology (in any mode) use the Geology Transparency slider
on the top right of the map.